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Document And Entity Information (USD $)
 12 Months Ended
Apr. 30, 2013
Jun. 24, 2013
Oct. 31, 2012
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Apr. 30, 2013    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2013    
Entity Registrant Name CASEYS GENERAL STORES INC    
Entity Central Index Key 0000726958    
Current Fiscal Year End Date --04-30    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   38,387,109  
Entity Public Float     $ 1,891,311,000
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes